president obama and mitt romney gearing up for their first debate. we're going to look back at memorable moments of past presidential debates. here the top three. here is frank luntz. do you think we'll see any of those big moments on wednesday night that define the campaign? >> that is the key. it's not the issues and numbers. voters remember specific phrases that candidates put together at key moments. now, the most important aspect has got to appear candid and got to touch people to make it memorable. let's take the first one. ronald reagan, 1981 presidential impact and had a huge impact. >> next tuesday, you will go to the polls and stand there in the polling place and make a decision. i think when you make that decision you need to ask yourself, are you better off than you were four years ago. is it easier for you to go and buy things in the store than it was four years ago? is there more or less unemployment in the country than there were four years ago? is america as respected throughout the world? >> we heard so many campaigns, are you better